CNC shield v4 engraving machine kit

CNC shield v4 engraving machine kit Document: http://wiki.sainsmart.com/index.php/101-60-506 Note: nano A4988 driver do not inserted wrong direction, otherwise it will damage ! Content list: 1 x nano (with USB cable) 1 x V4 engraving machine expansion board 3 x A4988 stepper motor driver Features: 1. 3 axis stepper motor driver 2. Compatible with micro-drive laser engraving machine, 3 axis CNC . 3. up to 2 A output current per coil. 4.Released the digital IO interface, easy to connect to other modules, e.g. ENDSTOP. 5. Released the I2C interface, you can connect to the LCD I2C or kindly 6. Power DC5v interface, 7.5-12V voltage input. 7. GRBL compatible 8. Worked with arduino nano. CH340 Nano 3.0 controller is a small, complete board based on the ATmega328. Its a open source Simple I/O platform with 12 Digital I/O Pins (of which 6 provide PWM output), 8 Analog Input Pins, pin 0 (RX) and 1 (TX) used to receive (RX) and transmit (TX) TTL serial data, a Mini-B USB connection, an ICSP header and a reset button.